Measured service telephone svstem



W. W. OWEN.

MEASURED SERVICE TELEPHONE SYSTEM.

APPLICATION FILED MAY], 1917 Patented Oct. 26, 1920.

4 SHEETS SHEET 1.

W. W. OWEN. mEAsuREn SERWCE TELEPHONE SYSTEM.

\PPLICA'HUN FILED MAY 1, 191?.

Patented Oct. 26, 1920.

4 SHEETS-SHEET 2.

W. W. OWEN. MEASURED SERVICE TELEPHONE SYSTEM.

1,356,654 APPLICATION FILED MAY 7. I917. Patented Oct 26, 1920- 4 SHETS-SHET a.

W. W; OWEN.

MEASURED SERWCE TELEPHONE SYSTEM, APPUCAHON HiED MAY 1. 191?.

1,356,654. Patented Oct. 26, 1920.

UNITED STATES PA rENT OFFICE.

WILLIAM WALTER OWEN, 0F ELGIN. ILLINOIS ASSIG NOR T0 AUTOMATIC ELECTRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

MEASURED-SERVICE TELEPHONE SYSTEM,

Specificatiuu of Letters Patent.

Pull-mod 01-1. 26. I920.

Application filed May 7. 1917. Serial No, 167,155.

p nlmi'liinvnt nfmv invention I have n.4-

the cam wheels of the impulse sender may be varied accordingly).

M invention may e-more clearly understooi by reference to the-drawings.

The substation A, Fig. 1) may e of any well known common attery type and oomprises the transmitter 2, receiver 3, calling device 4, controllin the impulse springs 5 and 6, and switch ook 7. for control ing the usual switch hook springs to disconnect the ringer 8 and condenser 9 and to connect the transmitter and receiver, in series with the impulse springs, across the line conduc tors 10 and 11 leading to the exchange.

The line switch 0 in which the hue couductors 10 and 11 terminate is similar in all respects to that shown in U. S. Letters Patent $1,186,823, granted June 13, 1916, to Fran Newforth, J r., and comprises among other details a lunger (not shown) attached to the end 0 a so-called plunger arm 12, which is controlled by the magnet 13, to force into contact, in pairs, a bank of contact sprin s 14 to 21 inclusive, to thereby extend tn line conductors 10 and 11 to a selector switch D.

The master switch (i (Fig 1) is also similar in all respects to that shown in the above mentioned patent and need not be further described here.

The settor switch I) (Fig. 1) is similar in construction to that shown in U. S. Letters Patent 815,321, granted March 13. 1906 to Keith .rickson and Erickson except that the side switch has been omitted and the circuits have been somewhat modified to adapt it to the modern two-wire'systcm of operation. It com )rises among other details a line relay 22, bridge cut-ofi' relay 23, vertical ma nct 24, rotary magnet 25. release magnet 2 rotary interrupter relay 26 and a pair of relays 28 and'29, which are slow acting, that is, slow to decnergize when their energizing circuits are broken, and which control the switchin over from one magnet to the other. he vertical ma net 24 and rotary magnet 25, are controlled hy the line relay 22 to raise the shaft wipers 30, 31 and 32 to rotate them into engagement with some pair of contacts similar to 33, 34 and 35.

The selector repeater E, (Fig. 2 is similar in construction to that shown in atent No 1,312,558, T. G. Martin, Aug. 12, 1919, with the addition of the register controlling mechanism R adapted to operate in accordtruce with my invention, and certain new and useful circuit connections in connection thercwith. This selector repeater is provided with 5 wipers, 36 to 40 inclusive, the wipers 36 and 40 being line 'wipers adapted to be connected to contacts in the line bank which lead through trunk lines to other exchangcs. Th wipers 37 and 38 are private wipers for testing purposes. The banks over which these wipers are adapted to retate have no connection leading to the. other exchan es but are connected locally in order to diviile the trunk lines leading from the corresponding line contacts into groups and sub-groups, as pointed out in sai prior application. The wiper 39 is used only for discriminating purposes and is connected to the booster battery B"; The contacts in the bank over which the wiper 89 rotates are connected to the springs of the different cam wheels of the re istcr mechanism R. In case certain trunk iines leading from this bank extend to a city on exchange which is a greater distance from the originating exchange than usual, and which requires doublc the rate of charge per digit, then this booster battery is connected to a cum wheel of the register mcchanism which has double the number of teeth or )rojections, so that the number of the impuises returned to the meter will be double the number of digits transmitted. This selector repeater conr )riscs among othcr-details the line relay 45, back bridge relay 46, private magnet 47, busy test relay- 48, and a number of any iliary relays, several of which, namely rclays 54, 53, 51, and 49, are slow to deencrgize when their energizing circuits are broken. The movement of the shaft wipers is controlled through the medium of these relays and their contacts and by means of the vertical magnet 58 and rotary magnet 57, the control of the line relay over said magnets being switched from one to the other by means of the usual side switch comprising the wipcrs 71, 72, 73 and 74 controlled by the usual pri rate magnet 47.

Each selector repeater is provided with a register controlling mechanism It compris ing a shaft 65, a pair of cum wheels 63 and G4, a ratchet wheel (1] associated with the cam wheel 03, a ratchet (32 associated with the cam wheel 64, a stepping magnet for driving said shaft in a. counter clockwise direction, and a release magnet 59, which upon energizing withdraws its armature (which acts as a. catch) from the teeth of the ratchet 62, and allows the clock spring to return the shaft and. cam wheels to normal position. The cam wheels are loose on the shaft 65 and remai in normal position while the stepping magnet drives the shaft in a counter clockwise direction, However when the shaft is returned by the clock Spring thc cam wheels are rotated in a c ockwise direction with the shaft by means of the catches or dogs and 70, thereby bringing the springs 66 and 67 and 68 and 69 into engagement a number of times according to the number of teeth on the cam wheels. These teeth may be varied in number according to requirement as hereinbefore pointed out. The steppin magnet 60 of the mechanism is controlled y the slow-acting relay 53, which relay is operated only once for each set of impulses transmitted over the trunk line leading to the next exchange. The slow-acting relay 54 is used for dis criminating purposes and is energized only when an incoming selector seizes the line to the selector repeater as will be pointed out. An additional relay 51 is also provided to release the register controlling mechanism R and )revent it from delivering impulses to a su bscribers meter in case a call is set up and the -alled subscriber fails to re spond.

The selector D (Fig. is similar to the selector D (Fig. 1) with the exception of the magnet which is legged oil from the release trunk to battery. This selector is am cessible only to incoming calls from selector repeaters in another exchange. The magnet 75 is for the purpose of energizing the rclays. similar to 54. in the selector repeater with which this incoming selector connects, when the call originates in another exchange.

Tho selector repeater ll' (Fig, ll is simi' lar in all respects to the soloctor ropcator i. (Fig. 2).

Tho selector D (Fig. 4) is an incoming scloctor ol the third oxohango similar to tho solcotor I) (Fig, 8).

The oonnootor switch l (Fig. ll is SiHIl lar in all respects to tho connector shown in the before moutionod Lottcrs Patent #hltllij' ilil and is ollho lioostor battory typo. that is. whon tho callod man answers. an impulso of current from tho booslor battory ll is transmitted back oror tho roloaso trunk to tho calling subscribors motor. This impulsc ot' boostor curronl is otloctiro only in caso a call is local to one cxchango. Tho back bridge of this oonnoolor switch also rovorsos the battery in the trunk lino loading back toward tho calling line and this l'orcrsal is oll'cctir'o whon a call is roroiroil from another ex hange. to roloaso tho registcr controlling mechanism of tho solcctor ropoator in the originating exchange. The conuoclor I oomprieos among othor details tho lino rola v l ll. which is bridged across tho lino conductors through tho springs of tho bark bridgo rolay lilil. tllo roloasc rolay 13.3. busy rolay l lli. sorirs rola 13?. ring cul oll' rolay i l ringing rcla lllll. wiper cuboll' rola v llll. additional back bridgo ro la 12%;. and auxiliary rcla 2T1). 'lbosc rolays oonlrol tho \ortioal magncl H2. and rotary magnot ill. to stop tho wipers H6. H7 and ill-l. into ongagomcnt with a dosirod lino.

Tho substation and lino switch arc in all rospocls similar to tho substation and the lino switch llariug giron a gono 'al d soription ol llaapparatus inrolvod I will now oxplaiu in dolail how a subsorib at su station may obtain oonnootion with tho subscriber at substation A and how the proper charge may be assessed upon the meter of the ca 1- ing subscriber. We will assume for the purpose of this explanation that three digits are required to call through each exchange shown, one for each selector and two for each selector-repeater and connector. The subscriber at A must therefore send three digits to call out of his own exchange. three to call through the intervening exchange, and three to call a subscriber in the third exchange. It will be understood that this arrangement is only arbitrary and may be varied at will to suit existing conditions.

l pon the rcmoval of the receiver at the substation from the switchhook. the talking circuit of the substation is bridged across the line conductors l1) and 11 by the hook switch springs. thereby closing the circuit of the line relay H of the line switch This circuit extends from ground (1? through springs 15o and 151. line 11, substation line 1 springs 152 and 153. and line relay l4!) to batter} ll. llclay 14! upon energizing. closes the circuit of the operating winding Hi4, which energizes and disconnects the relay H9 from the lino and thrusts the plunger into the terminals of the trunk before which it is held by tho master switch. The springs 14 and 1 and i7 and 2! being pressed together. extend the connection to the selector switch I and close an cnorgiw ing circuit for tho lino rolay 2:2 thorool.

which circuit extends from ground ti through the lowcr winding of relay 22.

springs 1m; and 1435. springs .21 and 1?. to and through the substation and back through springs l4 and I 1 7 and 15a. and upper winding oi rolay 22 to battor ll. The lino relay. upon energizing. olosos :1 oil'- cuit from ground (l through springs ion and H37. to the relay i and battory ll. Tho relay 28. upon energizing. supplies a holding ground for tho winding if)? of tho lino switch from ground ii to hold the plunger in ongagomonl with the bank springsai'tor the rolay l-ill has t'allou back. Although a branch of tho circuit extending to winding 15:) also extends through tho motor J to battory. tho motor is not opcratiroly onorgizod. tho winding thorool' being of oomparativoly high rcsistanco and tho armature boing ad justcd so as not to opcratc by current from tho battery ll. Tho motor -l is somewhat ditl'cront than tho motor shown in said lick tors latent. in that. it will not hold up after it hasboon once oporatod. but will doi ncrgizc al'tor oaoh impulse of booslor battory. The preliminary non-numcrioal oporations boing completed. lho lino rolay 21. is now oporatod in accordance with the first digit of the called number to operate the vertical magnet 24 to stop tho wipers 31). Ill and 32 to some lcrol of tho banks. from the contacts of which. trunk lines load to solcctoeropoators relay 45 to battery It.

which have access to outgoing trunk lines. As soon as the desired level is reached and the impulses cease, the rotary magnet 25 is operated to rotate the wipers into engagement with an idle one of said trunk lines, which we will assume leads to the select0r repeater E (Fig. 2). As soon as this idle trunk line is found the bridge cut-oil relay 23, which, during the rotation over busy trunk lines has been short circuited by the ground on the private contacts, energizes over the following circuit ground G", armature 170 and its front contact, relay 23, interrupter springs 171 of the rotary magnet, oft-normal springs 172. and throu h relay 1343 to battery ll". The relay 213 is ol a lower resistance than relay 23, and does not enei gizc over this circuit. The relay 23 however, energizes. and connects the relays of the switch D from the line conductors and extends the line conductors 10 and 11 through the wipers 31' and .33 and ill and 35 to the line relay 45 of thp selector repeater.

The line relay 1%). ol' selector -repeater E (Fig. 2) energizes over the following cir cuit: ground ti, lower winding of relay 4: springs 17R and 176 of relay 16. contact 35, wiper 31, springs 164 and 165, springs 21. and 17, line conductor 11, substation A, line cmnluctor 1H. springs 14- and 18, springs 157 and 158, wiper 3t). contact 33, springs 175 and P73. and through the upper winding of llclay 45 upon en ergizing over this circuit, closes a circuit from ground (i through springs 180 and 181. and relay to battery ll. The relay 50. upon energizing, supplies a luilding ground for the relay 23 of selector D over the following circuit: ground ti, springs 189 and 18". through the low resistance relay 54-. contact 3!, wiper J32. springs 160 and 161, relay i3 3, springs 17], oil-normal springs 17:2. and relay 26 to battery B. The relays 2t; and :31 do not energize over this circuit in series with the high resistance rclay 23. The relay 23 ishowevcr held in its operated position to maintain the connection through to the selector repeater.

The subscriber at the calling substation now operates his calling device for the second digit, thereby momentarily interrupting the circuit of the line relay 45 of the selector repeater E a number of times,'depending upon the level of the bank in which the trunk with which he desires to connect is located. The relay 50 is slow acting and retains its armaturcs in operated position during the energization and deiinergiaation of the line relay. Each time the line relay 45 det nergizes, therefore. a circuit is closed from ground (I through the springs. 180 and 179, springs 189 and 190, relay 49, vertical magnet 58, and side switch Wiper 71. (in first position) to battery B The impulses transmitted through the vertical magnet cause said ma net to raise the wipers to a. position opposite the desired level of bank contacts, the first sub-group'of which level we will assume is connected to incoming selectors in the third exchange similar to D (Fig. 3). The relay 49, which is included in this circuit in series with the vertical magnet is a slow-acting relay and remains energized during the entire time the vertical magnet is operating. In its energized position the relay 49 completes a circuit from ground G through springs 191 and 193 and private magnet 47 to battery ll. lV hen the relay -19 delinergizes after the last impulse is delivered to the vertical magnet, it breaks the circuit of the private magnet 47, which thereupon denergizes and allows the side switch to pass from first to hecond position. The side switch Wiper 71, in passing from first to second position, transfers the battery connection from the vertical magnet 58 to the rotary magnet 57. Therefore when the calling subscriber opcrates his calling device for the next or third digit the operation of the line relay 45 transmits a series of impulses through the rotary magnet to rotate the Wipers 36, 37. 38, 39 and 40 onto the first trunk line of the first group which in this case leads to the selector D (Fig. After the impulses f or this digit cease the relay 49 again dcencrgizes and allows the side to pass from second to third position, that is, assuming this trunk line to be idle. If this trunk line had been busy however the Wiper 37 would have found the contact with Which it on gaged provided with a guarding ground potential. This guarding potential would have provided an euer rizing circuit for the relay 55, extending rom wiper 37. side switch wiper 73 (in second position}. and relay 55 to battery 13. The relay 55, upon energizing, completes a circuit from ground (Ji through springs 194- and 195 and the private magnet to battery WU This cir cuit maintains the private magnet energized after the relay 49 is deiinergized and there fore holds the side switch in second position. The denergization of the relay 49 after this set of impulses closes a new circuit for the rotary magnet from ground G, springs 191 and 192, springs 196 and 197 of relay 55, springs 198 and 199, springs 200 and 201 of relay 4S, rotary magnet 57, and side switch Wiper 71 to battery B. The rotary magnet will energize over this circuit to step the shaft wipers to the next trunk line, and also closes a circuit from ground (i through springs 202 and relay 56 to battery 13. The relay 56, upon energizing. interrupts the circuit of the rotary magnet at the springs 198 and 199. The rotary magnet in turn dei nergizes and breaks the circuit of the relay 56, which in turn deiirergizes and again closes the circuit of the 1'0- wry magnet. The relay 55 will remain ergizetl as long as the Wiper 37 (iontinnos to engage grounded contacts of busy trunk lines, and the rotary magnet will continue to advance the wipers step-by-step until a nongroumletl contort is tounilfwhirh will permit the relay 5.- to ilei nergize. or until the wipers 3T nnil 38 (-tlglzlge a pair of row tarts Wllil'll are COl'llltittiii together. The last trunk line of earl) lli "I()ll] has a pair of rontarts similar to 42 aml L whi'h are ronner-toil together and the svlertor re 'ie-(iter upon living :Hlvanretl to this last iiiltih line will come to rest whether the line assouiatetl therewith is itlle or husy ill'll'l if husy the side switch is locked in sevontl position and :1 husy tomgivon to the railing subscriber in the manner pointed out in soul prior up pli ation #GJIUGR When the wipers of the selector repeater come to rest. upon the contacts of an iillo trunk lino :un'l the siile switrh passes to third position as has lit-on explained, the runner:- tion is roniplelml u itlthe trunk conductors 203 tlfi tl 55H by the rlosure ot' the hark volitacts 205 and 206 of the private magnet. The siile switch wiper T3 upon passing to third position extends a gua ding potential from ground 2" through the wiper T3 and the private wiper 37 to tluprivate haul: (gontart of the seized trunk line in the bunks. of all swit hrs whivh have ,-{t'\(r thereto. The side switch wiper 74, upon roar-hing thiril position, ('omplvtes a lll'ltl;,f( ilii'tlsr, the trunk roni'lurtors 2H3 arnl f ll "\i'hrreupon tioline relay 77 ot' the selertor I) (Fig). heroines energizer! over a rirquitfrom grounl ii, through the lower whaling" of relay 7?, springs 215 and 2H, (ffllltllli'tfll' zo-L c-uifatzirt, 45, wiper 40, sicle switrh wipm" Tl. impel HRH) coil 2L6. lower winding of hark hriiigo relay 4t). springs in? and W! of line rrlsjv 45. wiper 36, Contact 4-1, roialuiitor 3H3 s rings and 2H7, and upper windin oi relay T7 to battery ll". The lino rrlsrv Ti energizes over this (-irruit' illlfi vlfhl's the virrnit of relay 1 9. The rrla v it; of the silt-rim? repeater E one wintlin; ol' whirl: was li rluilml in the above trareil (-irrnit, ilornot energize at this time, the rurrent flowing in tlw lower winding being in the opposite tllllttlflll tolhat flowing in the upper wholing. The rirt'uit tor the upper r-rizniimz ot saiil relay mav be trans] from ground ii" hrou g'h isprinig 217 (\Yllit'lt were ('l lhl li on. the first vertival step of tho switch ll} anal 'hrough the upper whaling oi l'rluy o to battery B The relay 4 requires thr l ner gimti of both \viiullpgs ll! the sauna hrow tion in Ul'tii to oporat'irely riwrgizr.

When the suhstat ion milling ilri ire Hop -i :ltwl tor the 4th digit the rirruit oi the line n-lav iii of the srlet'tor rt-pmali-r ii is gain intvi'rnplrtl momrn aril zi anemia-r i i times.

The separation of the sp 'ings 1H1; Illll lei;

at this time, opens the bridge across the trunk conrlurtors 203 and 204,,therehy break-- ing the circuit of the line relay 77 of selector l). The line relay 77 in response to the opening and closing of this bridge operates in the same manner as the line relay 22 of MlPl'tU! I) (Fig. l) to control the vertical and rotary magnets 82 and 83 to pick out an. idle trunk. Each time the line relay 45 of the si-lertor repeater E tlei nergizos to repeat an impulse to the lino relay of the connortm'. a rirruit is rlosed from ground G through springs 180 and 179, springs 189 and 190, relay 4%), relay 53, and side switch wiper Tl to hottory B The operation of the. relay ill is tunrtionloss and simply rnnsrs the private n'mgnet to open the trunk uomlortors leading hack to the romlensers while impulses are being repeated. The relav 5;l Ewing sl w-acting. remains in its energized position ilurinp the entire time the relay 4:: is o iierating in response to a iligit. This ope 'ation of the relay .13 accomplishes a tlouhle result, namely, the short cirrniting of the msistant-e 216 and one whaling of relay l6, to remove their resistance from the rireuit of the line relay 77 of selector 1 and the operation of the steppin; magnet (3i! ot the rrgistel' controlling oiwhanism ll. The rirruit for the magnet of! mat in; {l'iltlll from gr und (W through springs 21 and 52k". springs ito and 22L aial magnet m to liati'ory H The magnet ti np n rni i'gjizaing attracts its armature air? steps thrratrhvt wheel a1 one step in a muuiirr rlorltwise tlirertion. As pointed out hereinhrlore the ram wheels 63 and (3+ (10 not more at this time, but the ratchet wheels 6 and it'll being rigid on the shaft, rotate, togjrtllvi nilh the shaft anil store up tension in tho l-lorl; spring i\ Fti-r the impulses for this digit wasig the rirt'uit of the relay 511 El; hrolwn at mntarts 1H! and i7!) oi" the line relay {Hill upon :lei' nrrgizing allows the nmgrui-t till to :lvinergizv in tour The rail-hi l whorls .31 and (i2 are lltltl in their oprrat-ril position by lll!1lllot the armature of thrrolea r relay 59 \Ylllt'l] engages the tr th oi i';ii' lil't wheel (32.

Returning to the operation of selrrtor l) it); is won as an l(ll( trunl: lane in wol howling; to tho solve-tor repeaters urinal inwhimgo has horn srimal. the r lm' Ii i om-lo irril in tho same mannur :18 lmrr-lm; 2 oi selri-tor ll and operates to :Iiw-iu-siairt the oporating relays ot thrselr 'ior from tlatrunk lines 2113 and 2H4 and to i-ouorrt saiil trunk lines through the oip rs ll)! unil 1W3 to tho srlortor repeater lfi".

i viit'llli is thereby rinsed tor the line rvlnv of tho selortor rr 'ieulier E extendingimo! g'i'onml (i through the lower xiialinp' oi swi l relay springs 223 unel 324, minim-t l li. viper lI Il, wing 21 unit 21%.

I closes a circuit for the relay )0, which in and over the e across the conductors 203 and 204 an ck over the other side of the line through springs 208 and 209, wiper i091, contact'105, springs 225 and 226, and up er winding of relay 87 to battery B he line relay 87, upon energizing,

turn energizes and supplies a holding ground for the relay 76 of the selector D, which extends from ground G" through springs 230 and 231, relay 84, over the private conductor to contact 106, wiper 104, springs 211. and 212, and through the re lays T6 and ill to battery B A branch of the above traced circuit extends from the spring 212 through the relay to hattery It will be seen that this circuit dill'ers somewhat from the holding circuit of the relay 23 of selector D in that the relay 7!) is connected in multiple with the relays 76 and 80. All of the incoming selectors of each exchange which are accessible to in coming calls only are equipped with a relay similar to the relay 75, the purpose of which is to so increase the current flowing in the circuit through th relay 84. or similar relays as to allow said relays 84 to operative, energize to disconnect the regisr ter controlling mechanism R from the controlling relays of the selector repeater E. The relay 4 will therefore energize over the above lllu'td circuit and will maintain the circuit of the stepping magnet 232 of the controlling mechanism open at the springs 23h and the circuit of the release magnet i l-l open at the springs 2ilsi.

"hen the snhstation calling device is op (rated for the 5th digit. the circuit of the line relay 45 ot the selector repeater l is again interrupted a number of times The separation f the springs 1M and l and the resulting interruption of the bridge across the conductors 202i and i 'll. in this case opens the ircuit of the line relay 7 of the selector repeater i l a corresponding number of times, to in turn control the vertical magnet in in the same manner as set l'ortli in connection with the line relav -l5 of switch l). The slow acting relay 53 of the rtltt'lhl repeater E is again energized once in response to the operation of the line rein) if) over the previously tra ed circuit and again close-s the circuit of the stepping magnet (Il of the register controlling mechanism ll. 'lhc ratchet wheel (ll is thereupon given a second step and the relays 53 and magnet 64) again dci nergixe upon the cessation of the impulses through the line relay.

When the substation calling device is operated for the next digit the circuit of the line relay 45 of the selector repeater E is again brolccn a num er of times and again operates to repeat a corresponding number of impulses to the line relay 8? of selector repeater E (Fig. 3), and to step the ratchet wheel oife more step through the medium of the relay 53. The line relay 8? in response to the impulses of this series, operates to control the circuit of the rotary magnet 97 to rotate the wipers 1()8'-1 12 inclusive, onto the terminals of an idle trunk line in the desired subgroup, the trunk lines of which lead to a third exchange and which ljerniinate in selector switches D (Fig ll. is soon as the wipers come to rest or the con-- tacts 113-117 inclusive, a circuit -l an! for the line relay 120 of the sell for l as follows: from ground G through the lower winding of the line relay 12 springs 24% and 245, contact 117. wiper 1152. side switch wiper 101, resistance 9.47, lower winding of hack bridge relay 96, springs ll and 'l-lfi, wiper 108, contact 113, springs 2-)? and 231i. and u ner Winding of relay 120 to battery l3. he back bridge rela 86 of the so lector repeater E being similar to the relay 46 of switch IQ docs n t opcrativcly energize over the above traced rircuit, the current in the lower winding being in opposition to that flowing in the upper winch mg. The line relay 12d, however. energizes over this circuit and closes a circuit for the relay .250, which energizes to pro-- pare the circuit of the vertical magnet.

\Vhcn the substation calling device is op erated for the next digit of the called nuul her, the circuit of the line relay 451 is again opened a number of times and again opcrates to transmit a corresponding number of impulses to the line relay RT of selector repeater E (Fig. 3). The side switch ofthe selector repeater E being in third position at this time. each time the line relay decncrgizcs the (ll'cllll of the line re ay tilt of the selector D (Fig. 4) is lllnltn at the springs 24R and B ll in the same nmnncr in which the line relay TT of selector l was controlled b v the line relay 45 of selector repeater E. It will thus be seen that the inr' pulses for this and the 'Fullmving digits are relayed or repeated twice, first by the line relay l5. and again by the line relay 37 The line relay 120 operates in response to this digit. to raise the wipers 123G iii? and 1123* to some level of the banks from nuich trunk lines lead to connectors similar to connector F. .\s soon as the impulses cease, the rotor magnet i2?) is brought into op cration in the usual manner to rotate the wipers to the contacts of an idle trunk line, in this case the contacts 1:39, 130 and 1331. Referring again to the selector repeater E, the relay 53 again energizes during the op eration of relay 4? and closes the circuit of stepping magnet (10 whereby the ratchet wheel (ll is "iron a fourth step. Although the slow-acting relay S5 of selector repeater 1C is also energized at this time by the relay 87, the stepping magnet Elhl is not energized, due to its circuit being held open at the springs 234 of relay 84 as previously explained.

As soon a the wipers 126, 127 and 128 come to rest on the contacts 129, 130 and 131, the relay 119 is ener ized and operates to extend the connection t rough the wipers 126 and 127 to the line relay 134 of connector F. The circuit for relay 134 extends from ground G through the lower winding, oi relay 134. springs 251 and 252, contact 130. wiper 127, springs 244 and 245, and over the previously traced circuit through the lower winding of the back bridge relay R6 of selector repeater E and spring 248 and 219. and back over the other side of the trunk through the springs 237 and 238. wiper 126, contact 129. springs and 254, and upper winding of relay 134 to:battery B. The relay 86 for reasons stated before does not energize over the circuit, the line relay 131, however energizes and closes a circuit from ground (1, springs 25? and 258 and relay 135 to battery R the relay 135 in turn energizes and supplies a holding ground for the bridge cut-oil relay 119 of the selector I). The circuit for the relay 119 extends from ground G through springs 26! and 262, springs 263 and 264, contact 131. wiper 128, springs 2-10 and 241,, and through the relays 119 and 122 in multiplc with the relay 118 to battery B When the substation calling device is on crated for the next digit, the circuit of the line relay ll) of selector repeater E is again broken a number of times, and re )eats the impulses to the line relay 87 of selector to pcater E, which in this case, by the separation of the springs 248 and 249 repeats a c0rresponding number of impulses to the line rcla y 134 of the connector F over the previously traced circuit. The operation of the relay 53 of the selector repeater E again closes the circuit of stepping magnet 60, whereby the ratchet wheels 61 and 62 are given a til'th step. The relay 135 of connector I being slo w-acting. the operation of the line rclay 134 controls the circuit of the vertical magnet 112 to raise the' Wipers 14.6, 147. and 148 to the level of the bank in which the cmiductors of the desired line ter minate. in the well known manner and as pointed out in the above mentioned Letters Patent #1186323. The slow-acting relay 137 which is included in the circuit of the vertical magnet, definergizes, when the impulses for thisdigit cease, and substitute the rotary magnet 141 for the vertical magnet 14-2. to the control of the line relay 134 by means of the side switch.

Whcn the substation calling device is opcrated for the last digit the circuit of the line relay 45 is again broken a number of times, the magnet (ill is also operated to give the ratchet wheels 61 and (2 a sixth and last step, and the impulses are repeated over previously traced circuits to the line relay 134 of connector F. The line relay 134 0pcratcs in response to this series of impulses to deliver a corresponding number of impulses to the rotary magnet 141 whereby the Wipers are rotated to the contacts of the desired line. Assuming the called line to be idle the side switch now passes to third position and the ringing relay 139 is intermittently operated to disconnect the calling line from the called line and to apply ringing current from the generator H to the terminals of the called line. The side switch \viper 265 on passing from second to third position establishes a guarding potential on the private contacts of the called line and closes an energizing circuit for the. cut-off winding 145 of the called subscribers individual switch whereby the line and operating magnets are disconnected from the line conductors.

When the called subscriber removes his receiver from the switch hook. in response to this signal. or as soon as the ringing relay 139 dccnergizes, it it is energized at the time, a circuit is closed from ground U through the relay 133, springs 266 and 267, springs 268 and 269, wiper 148. to and through the substation A and back over the other side of the line through the wiper ill), springs 27" and 271, springs 272 and 273, and through the relay 132 to battery B The relay 133, upon energizing, reverses the connections of the line relay 134 to the trunk conductors. and thereby reverses direction of the current flow in the trunk. The relay 132, upon energizing, closes a circuit from ground G through the oft-normal springs 274. springs 2275, relay 276, and through the ring cut-otl' relay 136 to battery 13*". The relays 276 and 136 cncrgize over this circuit, and the relay 1 th upon energizing, opens the circuit of the ringing relay 139 and locks itself ,to gronnd (1 by means of the springs 27?. When the springs 27? engage it will be seen that the relay 276 is short circuited and;inin'iediately dei ncrgizes. This nu'imcutary cnergization of relay 276 connect the battery B in series with the release trunk. This battery has the negative pole grounded instead of the positive pole as the other battery and therefore a booster impulse is transmitted over the release trunk. This booster impulse is ciicctive in local calls in one exchange and is used to operate a meter as explained in the before mentioned patent. Of course in the call which I have illustrated this booster impulse will be functionlcss as the rclcase trunk docs not extend to a meter. The reversal of current in the trunk by the relay 1 B energizes the hack bridge relay 2-16 of the selector repeater E (Fig, 3), the current in both upper and ferent lengths, and nieans for automatically operatin said registering device a, predetermined number of times for each call in accordance with the length of the trunk lines used.

2. In a telephone system, calling and called subscribers lines, a registering device for each line, means for extending said calling line into connection with a called line by means of a series of trunk lines of different lengths, and means controlled by the called subscriber for automatically operating said registering device a predetermined number of times for each call in accordance with the length of the trunk lines used.

3. In a telephone system, calling and called subscribers lines, a registering device for each line, means for extending said calling line into connection with called lines by means of a plurality of trunk lines of different lengths, and means controlled by the called subscriber foroperatin said registering device a predetermine number of times for each call in accordance with the length of the trunk lines used.

4. In a telephone system, a plurality of exchanges, subscribers lines in each exchange, means for extending a connection from a line in one exchange to a line in any other exchange, a register for the calling line, and means controlled by the called subscriber for operating said it ister a' number of times, depending u on t e humber of exchanges through which said connection extends.

5. In a tele hone system, a plurality of exchanges, su scribers lines in'each exchange, means for extending a connection from a line in one exchage to a line in any other exchange, a register for the callin line, and means controlled by the called subscriber for operating said register a predetermined number of times for each call, depending upon the distance between said connected exchanges.

6. In a telephone system, calling and called lines, a registering device for each line, means controlled solely by a calling subscriber for extending a connection from a callin to it called line by means of trunk lines o different lengths, and means controlled by the called subscriber for operating said registerin device a predetermined number of times or each call depending upon the length of the trunk line used.

' In a telephone system, calling and called lines, a registering device for each line, means controlled solely by a calling subscriber for extending a connection from a callin to, called line by means of trunk lines o did erent len he, and automatic -mcans controlled by t e called subscriber for operating said registering device only a predetermined number at times depending upon the length of the trunk line used.

8. In a telephone system, a plurality of exchanges, subscribers lines in each exchange, means controlled solely by the calling subscriber for extending a connection from a line in one exchange to a line in any other exchange, a register for the calling line, and means controlled by the called subscriber for operating said register a number of times, depending upon the number of exchanges through which said connection extends.

9. In a telephone system, calling and called subscribers lines, a register for each line, means for extending a connection from a calling to a called subscribers line by means of trunk lines of different lengths, a

register controlling mechanism common to' said lines, said mechanism controlled by the called subscriber to operate said register a predetermined number of times for each call, depending upon the length of trunk line used.

10. In a telephone system, a plurality of exchanges, subscribers lines in each exchange, means for extending a connection from a line in one exchange to a line in any other exchange, a register for the calling line, a register controlling mechanism, said mechanism adapted to operate said register a variable number of times, depending upon the number of exchanges through which said call is extended.

11. In a telephone system, calling and called subscribers lines, a register for each of said lines, means for extending a connection between said lines by means of trunk lines of different lengths, a register controlling mechanism, means for variably adjusting said mechanism, depending upon the length of trunk line used, and means for releasing said mechanism to operate said meter.

12. In a telephone system, calling and called subscribers lines,a register for each of saidlines, means for extending a connection between said linesby means of trunk lines of difl'erent lengths, a register controlling mechanism, means for variably adjusting said mechanism, depending upon the length of trunk line used, and means controlled by the called subscriber for releasing said mechanism to operate said meter.

13. In a telephone system, calling and .called subscribers lines, a register for each of said lines, means for extending a connection between said lines by means of trunk lines of difi'erent lengths, a register controlling mechanism, means for varia-blyadjusting said mechanism, depending upon the length of trunlr line used, and means for releasing said mechanism to operate said meter a variable numbenof times.

14. In a telephone system, calling and called subscribers, lines, a register for each fsaid lines, means for extending a connection between said line by means of trunk lines of difi'erent lengths, a register controlling mechanism, means for variably adjusting said mechanism, depending upon the length of trunk line used, and means con trolled by the called subscriber for releasing said mechanism to operate said meter a number of times.

15. In a telephone system, calling and called subscribers lines, a register for each of said lines, means controlled solely by the calling subscriber for extending a connection between said lines by means of trunk lines of different lengths. a register controlling mechanism, means for variably adjusting said mechanism, depending upon the length of trunk line used, and means for releasing said mechanism to operate said meter.

'16. In a telephone System, a plurality of exchanges, subscribers lines in each exchange, means for extending a connection from a line in one exchange through any number of intervening exchanges to a called line in another exchange, a register for the calling line, a register controlling mechanism, means for variably adjusting said mechanism depending upon the number of exchanges through which said connection extends, and means for releasing said mechanism to operate said register.

17. In a telephone system, a plurality of exchanges, subscribers lines in each ex change, means for extending a connection from a line in one exchange through any number of intervening exchanges to a called line in another exchange, a register for the calling line, a step-by-step register controlling mechanism, means for variably adjusting said mechanism depending upon the number of exchanges through which said connection extends, and means for releasing said mechanism to operate said register.

18. In a telephone system, a plurality of exchanges, subscribers lines in each exchange, means for extending a connection from a line in one exchange through any number of intervening exchanges to a called line in another exchange, a register for the calling line, a step-by-ste register controlling mechanism, means or operating said mechanism a number of steps depending upon the number of exchanges through which said connection extends, and means for releasing said mechanism to operate said register.

.19. In a telephone system,a line, a register for said line, a circuit for said register, a step-by-step register controlling mechanism associated with said register, a circuit closer controlled by said mechanism, means for operating said mechanism a predetermined number of times for each call; and means for automatically releasing said mechanism to operate said register a predetermined number of times each time the mechanism is brought into use to assess different tolls, by closing said circuit a number of times through said circuit closer.

20. In a telephone system, calling and called subscribers lines, switches for connecting any two of said lines, means for controlling said switches by a plurality of series of impulses to establish such connection, a register for the calling line, and means for operating said register a number of times, depending upon the number of series of impulses used.

21. In a telephone system, calling and called subscribers lines, a register associated with each line, means for extending a connection between two of said lines comprising a plurality of automatic switches, a register controlling mechanism associated with one of said switches, means for sending a plurality of series of impulses to said switches from the calling line to extend said connection, means for operating said mechanism once for each series of impulses, and means for thereafter releasing said mecha nism to operate said register.

22. In a telephone system, calling and called subscribers lines, a register associated with each line, means for extending a connection between two of said lines comprising a plurality of automatic switches, a register controlling mechanism associated with one of said switches, means for sending a plurality of series of impulses to said switches from the calling line to extend said connection, means for operating said mechanism once for each series of impulses, and means controlled by the called subscriber for thereafter releasing'said mechanism to operate said register.-

23. In a telephone system, calling and called subscribers lines, a register associated with each line, means for extending a connection between two ofsaid lines comprising a plurality of automatic switches, a register controlling mechanism associated with one of said switches, means-for sending a plurality of series of impulses to said switches from the calling line to extend said connection, means for operating said mechanism once for each series of impulses, and means for thereafter releasing said mechanism to operate said register a number of times, depending upon the number of times said mechanism was operated.

24. In a telephone system, calling and calledsubscribers lines, a register associated with each line, means for extending a com nection between two of said lines comprising a plurality of automatic switches, a register controlling mechanism associated with one of said switches, means for sending a plurality of series of impulses to said switches from the calling line to extend said connection, means for operating said mechanism once for each series of impulses, and

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means for thereafter releasing said mechanism to operate said re ister a number of times, depending upon t e number of series of impulses sent out by said calling sub scriber.

25. In a trunking system, a repeater, a registej controlling mechanism associated with said repeater, incomingselectors and local selectors having access to said repeater, means for operating said controlling mechanism when the repeater is seized by a local selector and means for rendering said mechanism. inoperative ,When the repeater is seized by an incoming selector.

26. In a telephone system, a calling line, a meter for said line, an automatic switch accessible to said line, a meter controlling mechanism associated with said switch, a plurality of called lines switch, means for extending a connection calling line to switch, means for then operating said switch to seize any one of said called lines, and means for operating said mechanism a pre determined number .of times before certain of said called lines are connected with and meansfor operating said mechanism a different number of times before others of said lines are connected with, and a circuit for said meter controlled by said mechanism.

27. In a telephone system, calling and called lines, means for connecting any two of said lines including trunk lines of different lengths a register foreach line, a register controlling mechanism common to said lines, an operating magnet for said mechanism and a re ease magnet for said mechanism, means for operating said operating ma net a number of times whena trunk line 0 one length is used and a greater number of times when a longer trunk line is used, and means for operating said release magnet to release said mechanism to thereby operate said register.

28. In a telephone system, subscribers lines, a register for each of said lines, means for extending local and long distance connections from one of said lines, and means controlled by the called subscriber for operating said register only once to register each local call and a plurality of times to register each long distance call.

29. In a tale hone system, subscribers lines, a register For each line, means for extending local and long distance connections from one of said lines, a register controlling device for controlling said register, said device controlled by the called subscriber for operating said register to register a long distance connection only.

30. In a tale hone system, subscribers lines, a register ibr each of said lines, means controlled solely b the callin subscriber for extending icon and long istance COII': nections from one of said lines, and means controlled by the called subscriber for operating said register only once to register each local call and a number of times to register each long distance call.

31. In a telephone system, a 'meter, a meter controlling mechanism for controllin said meter, a trunking switch associated Wit said mechanism for controlling the operation thereof, trunk lines accessible to said switch, means for operating said switch to seize any one of said lines, and discriminating means associated with each trunk line whereby said mechanism is operated only once before one trunk line is seized and a of times before another trunk line is seized in both cases through the medium of said controlling mechanism.

In a telephone system, a meter, a meter controlling mechanism for controlling said meter, :1 trunking switch associated with said mechanism for controlling the operation thereof, trunk lines accessible to said switch, means for operating said switch to seize any one of said lines and means In a telephone system, a meter, a connector switch operated in accordance with the digits of a called number to find a called line, said meter controlled over the called line through the medium of said connector switch in accordance with all the digits of the called number. 1

34. In a telephone system, a'meter, a connector switch for seizing :1 called line, a trunking switch for seizing said connector, means associated with said trunkin switch and controlled thereby for controllingsaid meter, said means also controlled from the called line through the medium of said connector switch to operate said meter in accordance with all the digits of the called number.

35. In a telephone system, a meter, means meter in accordance with all the digits of a called number a trunk switch associated with said means, trunk lines of different lengths accessible to said switch, and means whereby said meter is operated ,in one mann r when a trunk line for operating said of one length is seize by said switch and in another manner whena another length is seized.

36. In a telephone system, 'a calling line, a meter for said line, switches for estab lishing connections from said line, means associated with one of said switches for operating the meter, said means operated once for each digitof a called number used in operating said switches and controlled trunk line of after a connection is set up to operate said meter as many times as' said means was operated during the establishment of the call,

37. In a telephone system, calling lines, a meter for each line, a device common to said lines for operating said meters, means for extending a connection from one of said lines and associatir said device therewith, means for operatin r said device a variable number of times curing the extension of a mnnection and means for controlling said device after the call is extended to operate the meter as many times as the device was operated during the extension of the call.

:18. In a telephone system, a calling line, a meter for said line, a step by step register controller for controlling said meter. means gontrolled by the digits of a called number to extend a call to called lines, and to operate said register controller a definite number of times depending upon the number of digits in it called number, and means controlled by the response of the called subscriber for causing said register controller to operate said meter once for each digit of the called number.

39. In a telephone system, a meter, a" meter controlling device, means controlled by each digit of a called number when establishing a connection for storing up energy in said device, and means controlled after the establishment of a connection for allowing said device to deliver the energy stored therein to the meter to operate the same.

40. In a telephone system, a meter controlling device, means for establishing a connection between two subscribers lines in accordance with the di its of it called numher, said device controlled by each di *it of a called number to store up an impu seof current and controlled after the connection is established to deliver the stored up impulses to said meter to operate the same.

41. in a telephone system, a calling line, a meter for said line, a step by step register controller for controlling said meter, means cmitrolled by the digits of it called number to extend a call to called lines, and to operate said register controller a definite number of times depending upon the number of digits in :1 called number, and means controlled by the response of the called subscriber for causing said register controller to operate said meter once for each digit of the called number.

ln a telephone system, a meter. a

meter controlling device. moans controlled by each digit of it called number when establishing a connection for storing up energy in said device, and means controlled after the establishment of a connection for allowing said device to deliver the energy device after the call is extcnded to operat stored therein to the meter to operate 1hr: same. 1

43. In a telephone system, a meter. :1 meter controlling device, means for cslablishiug a connection between two subscribers lines in accordance with the digits of a called number, said device controlled by each digit of a called number to store up an impulse of carrot controlled after the connection is established to deliver the stored up impulses to said meter to operate the same.

44. In a telephone system, a calling line, a meter for said line, switches for cstablisln ing connections from said line. means associated with one of said switches for operating the meter, said means operated once for each digit of a called number used in operating said switches and controlled after a connection is set up to operate sanl meter as many times as said means was operated during the establishment ol the call.

45. In a. telephone system, calling lines, a meter foreach line, a device ommon to said lines for operating said meters, means forextending a connection from one of said lines and associating said device therewith, means for operating said device a variable number of times during the extension of a connection and means for controlling said the meter as many times as thedevice 7 operated during the extension of the call.

46. In a telephone system, a calling and it called line, automatic switches, means controlled by the subscriber on the calling line for operating said switches successively, to extend a connection from the said ralling line over a plurality of link conductors to the called line, a meter for the calling line, a meter controlling device operated one or more times as .each link coiahictor is added to the connection, said device con trolled after the completion of the canal tion to operate said meter in dt lilildll'i'ti with the number of timds the device was operated during the extension of the con nection.

47. In a telephone system. a calling line,

a called line, an automatic switch accessible to said calling line and controllable there from to extend connections to :tlie called line, a meter for the calling linei a meter controllingdevice associated with the switch for operating said meter, means for operating said device a plurality of times during he extension of the'call, the numbei of times the device is o )e"ated depending upon the number of digits delivered by the cltlling subscriber, said device then controlled to operate the meter.

48. In a telephone system, a line, a meter therefor, an automatic switch accessible to said lin, a meter controlling device individual to said switcln'a trunk circuit aceessible to said switch for use by the calling subscriber for extending connections from said line to called lines requiring varying toll charges, said device adjusted din-in" the extension of the call over said trunlc line in accordance with the proper charge and controlled by the response of the called suhsrriher to operate said meter in accord- :xnee with the adjustment.

Signed by me at Chicago, Cook county, 10 State of Illinois, this 26th day of April, 1917. 7

WILLIAM \VALTER OWEN. 

